somnambulation vs somnambulism

somnambulation and somnambulism both are nouns.

Word	Noun	Adjective	Verb	Adverb
somnambulation	Yes	No	No	No
somnambulism	Yes	No	No	No

As nouns, somnambulation and somnambulism are synonyms defined as:

Other synonyms of somnambulation include noctambulation, noctambulism, sleepwalking.

somnambulation (noun)	somnambulism (noun)
walking by a person who is asleep	walking by a person who is asleep